build(root): added initial meson build system implimentation and mk script

we will use meson as the build system for this project. Added a rough outline of this which builds source, libraries, and links them to tests (along with the google test library for testing). meson will be setup and compiled with ./mk.

meson.build

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+project('4DSSE', 'cpp', version: '0.0.1a', default_options: ['cpp_std=c++23'])
+
+# Add default visibility for all C++ targets
+add_project_arguments('-fvisibility=default', language: 'cpp')
+add_project_arguments('-Wl,-export_dynamic', language: 'cpp')
+
+
+subdir('src')
+subdir('tests')

mk

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+#!/bin/bash
+
+# if build directory is present, remove it
+if [ -d "build" ]; then
+  rm -rf build
+fi
+
+meson setup build
+meson compile -C build

src/meson.build

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+# Define the library
+dobj_sources = files(
+  'dobj/private/Metadata.cpp'
+)
+
+dobj_headers = files(
+  'dobj/public/Metadata.h'
+)
+
+# Define the libdobj library so it can be linked against by other parts of the build system
+libdobj = library('dobj',
+    dobj_sources, 
+    include_directories: include_directories('dobj/public'),
+    cpp_args: ['-fvisibility=default'],
+    install : true)
+
+# Make headers accessible
+install_headers(dobj_headers, subdir : '4DSSE/dobj')

tests/dobj/meson.build

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+# Test files for dobj
+test_sources = [
+    'MetadataTest.cpp'
+]
+
+foreach test_file : test_sources
+  exe_name = test_file.split('.')[0]
+  message('Building test: ' + exe_name)
+
+  # Create an executable target for each test
+  test_exe = executable(
+      exe_name,
+      test_file,
+      dependencies: gtest_dep,
+      include_directories: include_directories('../../src/dobj/public'),
+      link_with: libdobj,  # Link the dobj library
+      install_rpath: '@loader_path/../../src'  # Ensure runtime library path resolves correctly
+  )
+
+  # Add the executable as a test
+  test(exe_name, test_exe)
+endforeach

tests/meson.build

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+# Google Test dependency
+gtest_dep = dependency('gtest', main: true, required : true)
+
+# Subdirectory for dobj tests
+subdir('dobj')